Trouble Installing Windows After System Corruption

I recently experienced a corruption in my Windows installation after adjusting my RAM settings. After multiple attempts to fix it, I reached a point where the boot process got stuck on the loading circle. To recover my files, I used an external enclosure for my SSD, which worked great, and I was able to back up everything important.

Once I formatted the drives and reconnected them to my PC, I encountered freezing issues whenever trying to access my flash drive. Sometimes, I could make it past the loading screen and into the installation process, but I'd end up with a persistent black screen afterward. I attempted multiple wipes using diskpart clean and various reformats, but nothing changed. I also flashed my motherboard's BIOS and updated the SSD firmware without success.

Then, I recalled that my GPU and motherboard are PCIe 5.0, but my riser is only PCIe 4.0. These crashes began after I reset the BIOS to optimized defaults. So, I went back into the BIOS and adjusted the PCIe x16 setting to Gen 4 speeds. After doing this, I managed to boot from the flash drive and proceeded with the installation. Unfortunately, after the system restarted and showed "Getting Ready," I was met with another black screen.

I've been experimenting further but I'm stumped. I ran MemTest86 on my RAM and it came back fine, leading me to think the issue lies with the drives. I even tried an ASUS Secure Erase and installed Windows using just one stick of RAM, also testing each SSD individually. I've swapped M.2 slots and run with just one SSD, but the black screen issue continues. I'm really struggling to figure out what's going wrong here! My specs are: GPU: NVIDIA RTX 5090 Founders Edition, Riser: FormD T1 PCIE4 Riser, CPU: Ryzen 7 9800X3D, Motherboard: ASUS ROG Strix X870-I, Memory: Teamgroup T-Create Expert 32GB 6000MT CL30, Storage: 1x Samsung 990 Pro 1TB and 1x Samsung 990 Pro 4TB, PSU: Corsair SF1000.